title: Unmasking the evidence about masks.
authors.forename: Mary-Louise
authors.initials: ML
authors.lastname: McLaws
authors.forename: Jan
authors.initials: J
authors.lastname: Gralton
mesh_terms: D002487:Centers for Disease Control and Prevention, U.S.; D004867:Equipment Design; D006801:Humans; D017053:Infection Control; D007251:Influenza, Human / Q000517:prevention & control* / Q000635:transmission; D008397:Masks / Q000592:standards; D017410:Practice Guidelines as Topic; D014481:United States; D014944:World Health Organization